Merge remote-tracking branch 'remotes/origin/lh_multi_material_segmentation' into vb_print_regions

src/slic3r/GUI/Gizmos/GLGizmoMmuSegmentation.cpp

@@ -0,0 +1,671 @@
+#include "GLGizmoMmuSegmentation.hpp"
+
+#include "slic3r/GUI/GLCanvas3D.hpp"
+#include "slic3r/GUI/GUI_App.hpp"
+#include "slic3r/GUI/ImGuiWrapper.hpp"
+#include "slic3r/GUI/Camera.hpp"
+#include "slic3r/GUI/Plater.hpp"
+#include "slic3r/GUI/BitmapCache.hpp"
+#include "libslic3r/PresetBundle.hpp"
+#include "libslic3r/Model.hpp"
+
+
+#include <GL/glew.h>
+
+namespace Slic3r::GUI {
+
+void GLGizmoMmuSegmentation::on_shutdown()
+{
+    m_parent.use_slope(false);
+}
+
+std::string GLGizmoMmuSegmentation::on_get_name() const
+{
+    // FIXME Lukas H.: Discuss and change shortcut
+    return (_L("MMU painting") + " [N]").ToUTF8().data();
+}
+
+bool GLGizmoMmuSegmentation::on_is_selectable() const
+{
+    return (wxGetApp().preset_bundle->printers.get_edited_preset().printer_technology() == ptFFF
+            && wxGetApp().get_mode() != comSimple && wxGetApp().extruders_edited_cnt() > 1);
+}
+
+static std::vector<std::array<uint8_t, 3>> get_extruders_colors()
+{
+    unsigned char                       rgb_color[3] = {};
+    std::vector<std::string>            colors       = Slic3r::GUI::wxGetApp().plater()->get_extruder_colors_from_plater_config();
+    std::vector<std::array<uint8_t, 3>> colors_out(colors.size());
+    for (const std::string &color : colors) {
+        Slic3r::GUI::BitmapCache::parse_color(color, rgb_color);
+        size_t color_idx      = &color - &colors.front();
+        colors_out[color_idx] = {rgb_color[0], rgb_color[1], rgb_color[2]};
+    }
+
+    return colors_out;
+}
+
+static std::vector<std::string> get_extruders_names()
+{
+    size_t                   extruders_count = wxGetApp().extruders_edited_cnt();
+    std::vector<std::string> extruders_out;
+    extruders_out.reserve(extruders_count);
+    for (size_t extruder_idx = 1; extruder_idx <= extruders_count; ++extruder_idx)
+        extruders_out.emplace_back("Extruder " + std::to_string(extruder_idx));
+
+    return extruders_out;
+}
+
+void GLGizmoMmuSegmentation::init_extruders_data()
+{
+    m_original_extruders_names     = get_extruders_names();
+    m_original_extruders_colors    = get_extruders_colors();
+    m_modified_extruders_colors    = m_original_extruders_colors;
+    m_first_selected_extruder_idx  = 0;
+    m_second_selected_extruder_idx = 1;
+}
+
+bool GLGizmoMmuSegmentation::on_init()
+{
+    // FIXME Lukas H.: Discuss and change shortcut
+    m_shortcut_key = WXK_CONTROL_N;
+
+    m_desc["reset_direction"]      = _L("Reset direction");
+    m_desc["clipping_of_view"]     = _L("Clipping of view") + ": ";
+    m_desc["cursor_size"]          = _L("Brush size") + ": ";
+    m_desc["cursor_type"]          = _L("Brush shape") + ": ";
+    m_desc["first_color_caption"]  = _L("Left mouse button") + ": ";
+    m_desc["first_color"]          = _L("First color");
+    m_desc["second_color_caption"] = _L("Right mouse button") + ": ";
+    m_desc["second_color"]         = _L("Second color");
+    m_desc["remove_caption"]       = _L("Shift + Left mouse button") + ": ";
+    m_desc["remove"]               = _L("Remove painted color");
+    m_desc["remove_all"]           = _L("Remove all painted colors");
+    m_desc["circle"]               = _L("Circle");
+    m_desc["sphere"]               = _L("Sphere");
+    m_desc["seed_fill_angle"]      = _L("Seed fill angle");
+
+    init_extruders_data();
+
+    return true;
+}
+
+void GLGizmoMmuSegmentation::render_painter_gizmo() const
+{
+    const Selection& selection = m_parent.get_selection();
+
+    glsafe(::glEnable(GL_BLEND));
+    glsafe(::glEnable(GL_DEPTH_TEST));
+
+    render_triangles(selection);
+
+    m_c->object_clipper()->render_cut();
+    render_cursor();
+
+    glsafe(::glDisable(GL_BLEND));
+}
+
+bool GLGizmoMmuSegmentation::gizmo_event(SLAGizmoEventType action, const Vec2d& mouse_position, bool shift_down, bool alt_down, bool control_down)
+{
+    if (action == SLAGizmoEventType::MouseWheelUp
+        || action == SLAGizmoEventType::MouseWheelDown) {
+        if (control_down) {
+            double pos = m_c->object_clipper()->get_position();
+            pos = action == SLAGizmoEventType::MouseWheelDown
+                  ? std::max(0., pos - 0.01)
+                  : std::min(1., pos + 0.01);
+            m_c->object_clipper()->set_position(pos, true);
+            return true;
+        }
+        else if (alt_down) {
+            m_cursor_radius = action == SLAGizmoEventType::MouseWheelDown
+                              ? std::max(m_cursor_radius - CursorRadiusStep, CursorRadiusMin)
+                              : std::min(m_cursor_radius + CursorRadiusStep, CursorRadiusMax);
+            m_parent.set_as_dirty();
+            return true;
+        }
+    }
+
+    if (action == SLAGizmoEventType::ResetClippingPlane) {
+        m_c->object_clipper()->set_position(-1., false);
+        return true;
+    }
+
+    if (action == SLAGizmoEventType::LeftDown
+        || action == SLAGizmoEventType::RightDown
+        || (action == SLAGizmoEventType::Dragging && m_button_down != Button::None)) {
+
+        if (m_triangle_selectors.empty())
+            return false;
+
+        EnforcerBlockerType new_state = EnforcerBlockerType::NONE;
+        if (! shift_down) {
+            if (action == SLAGizmoEventType::Dragging)
+                new_state = m_button_down == Button::Left
+                            ? EnforcerBlockerType(m_first_selected_extruder_idx)
+                            : EnforcerBlockerType(m_second_selected_extruder_idx);
+            else
+                new_state = action == SLAGizmoEventType::LeftDown
+                            ? EnforcerBlockerType(m_first_selected_extruder_idx)
+                            : EnforcerBlockerType(m_second_selected_extruder_idx);
+        }
+
+        const Camera& camera = wxGetApp().plater()->get_camera();
+        const Selection& selection = m_parent.get_selection();
+        const ModelObject* mo = m_c->selection_info()->model_object();
+        const ModelInstance* mi = mo->instances[selection.get_instance_idx()];
+        const Transform3d& instance_trafo = mi->get_transformation().get_matrix();
+
+        // List of mouse positions that will be used as seeds for painting.
+        std::vector<Vec2d> mouse_positions{mouse_position};
+
+        // In case current mouse position is far from the last one,
+        // add several positions from between into the list, so there
+        // are no gaps in the painted region.
+        {
+            if (m_last_mouse_click == Vec2d::Zero())
+                m_last_mouse_click = mouse_position;
+            // resolution describes minimal distance limit using circle radius
+            // as a unit (e.g., 2 would mean the patches will be touching).
+            double resolution = 0.7;
+            double diameter_px =  resolution  * m_cursor_radius * camera.get_zoom();
+            int patches_in_between = int(((mouse_position - m_last_mouse_click).norm() - diameter_px) / diameter_px);
+            if (patches_in_between > 0) {
+                Vec2d diff = (mouse_position - m_last_mouse_click)/(patches_in_between+1);
+                for (int i=1; i<=patches_in_between; ++i)
+                    mouse_positions.emplace_back(m_last_mouse_click + i*diff);
+            }
+        }
+        m_last_mouse_click = Vec2d::Zero(); // only actual hits should be saved
+
+        // Precalculate transformations of individual meshes.
+        std::vector<Transform3d> trafo_matrices;
+        for (const ModelVolume* mv : mo->volumes) {
+            if (mv->is_model_part())
+                trafo_matrices.emplace_back(instance_trafo * mv->get_matrix());
+        }
+
+        // Now "click" into all the prepared points and spill paint around them.
+        for (const Vec2d& mp : mouse_positions) {
+            update_raycast_cache(mp, camera, trafo_matrices);
+
+            bool dragging_while_painting = (action == SLAGizmoEventType::Dragging && m_button_down != Button::None);
+
+            // The mouse button click detection is enabled when there is a valid hit.
+            // Missing the object entirely
+            // shall not capture the mouse.
+            if (m_rr.mesh_id != -1) {
+                if (m_button_down == Button::None)
+                    m_button_down = ((action == SLAGizmoEventType::LeftDown) ? Button::Left : Button::Right);
+            }
+
+            if (m_rr.mesh_id == -1) {
+                // In case we have no valid hit, we can return. The event will be stopped when
+                // dragging while painting (to prevent scene rotations and moving the object)
+                return dragging_while_painting;
+            }
+
+            const Transform3d& trafo_matrix = trafo_matrices[m_rr.mesh_id];
+
+            // Calculate direction from camera to the hit (in mesh coords):
+            Vec3f camera_pos = (trafo_matrix.inverse() * camera.get_position()).cast<float>();
+
+            assert(m_rr.mesh_id < int(m_triangle_selectors.size()));
+            if (m_seed_fill_enabled)
+                m_triangle_selectors[m_rr.mesh_id]->seed_fill_apply_on_triangles(new_state);
+            else
+                m_triangle_selectors[m_rr.mesh_id]->select_patch(m_rr.hit, int(m_rr.facet), camera_pos, m_cursor_radius, m_cursor_type,
+                                                                 new_state, trafo_matrix, m_triangle_splitting_enabled);
+            m_last_mouse_click = mouse_position;
+        }
+
+        return true;
+    }
+
+    if (action == SLAGizmoEventType::Moving && m_seed_fill_enabled) {
+        if (m_triangle_selectors.empty())
+            return false;
+
+        const Camera &       camera         = wxGetApp().plater()->get_camera();
+        const Selection &    selection      = m_parent.get_selection();
+        const ModelObject *  mo             = m_c->selection_info()->model_object();
+        const ModelInstance *mi             = mo->instances[selection.get_instance_idx()];
+        const Transform3d &  instance_trafo = mi->get_transformation().get_matrix();
+
+        // Precalculate transformations of individual meshes.
+        std::vector<Transform3d> trafo_matrices;
+        for (const ModelVolume *mv : mo->volumes)
+            if (mv->is_model_part())
+                trafo_matrices.emplace_back(instance_trafo * mv->get_matrix());
+
+        // Now "click" into all the prepared points and spill paint around them.
+        update_raycast_cache(mouse_position, camera, trafo_matrices);
+
+        if (m_rr.mesh_id == -1) {
+            // Clean selected by seed fill for all triangles
+            for (auto &triangle_selector : m_triangle_selectors)
+                triangle_selector->seed_fill_unselect_all_triangles();
+
+            // In case we have no valid hit, we can return.
+            return false;
+        }
+
+        assert(m_rr.mesh_id < int(m_triangle_selectors.size()));
+        m_triangle_selectors[m_rr.mesh_id]->seed_fill_select_triangles(m_rr.hit, int(m_rr.facet), m_seed_fill_angle);
+        return true;
+    }
+
+    if ((action == SLAGizmoEventType::LeftUp || action == SLAGizmoEventType::RightUp)
+        && m_button_down != Button::None) {
+        // Take snapshot and update ModelVolume data.
+        wxString action_name;
+        if (get_painter_type() == PainterGizmoType::FDM_SUPPORTS) {
+            if (shift_down)
+                action_name = _L("Remove selection");
+            else {
+                if (m_button_down == Button::Left)
+                    action_name = _L("Add supports");
+                else
+                    action_name = _L("Block supports");
+            }
+        }
+        if (get_painter_type() == PainterGizmoType::SEAM) {
+            if (shift_down)
+                action_name = _L("Remove selection");
+            else {
+                if (m_button_down == Button::Left)
+                    action_name = _L("Enforce seam");
+                else
+                    action_name = _L("Block seam");
+            }
+        }
+
+        activate_internal_undo_redo_stack(true);
+        Plater::TakeSnapshot snapshot(wxGetApp().plater(), action_name);
+        update_model_object();
+
+        m_button_down = Button::None;
+        m_last_mouse_click = Vec2d::Zero();
+        return true;
+    }
+
+    return false;
+}
+
+void GLGizmoMmuSegmentation::set_painter_gizmo_data(const Selection &selection)
+{
+    GLGizmoPainterBase::set_painter_gizmo_data(selection);
+
+    if (m_state != On)
+        return;
+
+    int prev_extruders_count = m_original_extruders_colors.size();
+    if (prev_extruders_count != wxGetApp().extruders_edited_cnt() || get_extruders_colors() != m_original_extruders_colors) {
+        this->init_extruders_data();
+        // Reinitialize triangle selectors because of change of extruder count need also change the size of GLIndexedVertexArray
+        if (prev_extruders_count != wxGetApp().extruders_edited_cnt())
+            this->init_model_triangle_selectors();
+    }
+}
+
+static void render_extruders_combo(const std::string                         &label,
+                                   const std::vector<std::string>            &extruders,
+                                   const std::vector<std::array<uint8_t, 3>> &extruders_colors,
+                                   size_t                                    &selection_idx)
+{
+    assert(!extruders_colors.empty());
+    assert(extruders_colors.size() == extruders_colors.size());
+
+    size_t selection_out = selection_idx;
+
+    // It is necessary to use BeginGroup(). Otherwise, when using SameLine() is called, then other items will be drawn inside the combobox.
+    ImGui::BeginGroup();
+    ImVec2 combo_pos = ImGui::GetCursorScreenPos();
+    if (ImGui::BeginCombo(label.c_str(), "")) {
+        for (size_t extruder_idx = 0; extruder_idx < extruders.size(); ++extruder_idx) {
+            ImGui::PushID(int(extruder_idx));
+            ImVec2 start_position = ImGui::GetCursorScreenPos();
+
+            if (ImGui::Selectable("", extruder_idx == selection_idx))
+                selection_out = extruder_idx;
+
+            ImGui::SameLine();
+            ImGuiStyle &style  = ImGui::GetStyle();
+            float       height = ImGui::GetTextLineHeight();
+            ImGui::GetWindowDrawList()->AddRectFilled(start_position, ImVec2(start_position.x + height + height / 2, start_position.y + height),
+                                                      IM_COL32(extruders_colors[extruder_idx][0], extruders_colors[extruder_idx][1], extruders_colors[extruder_idx][2], 255));
+            ImGui::GetWindowDrawList()->AddRect(start_position, ImVec2(start_position.x + height + height / 2, start_position.y + height), IM_COL32_BLACK);
+
+            ImGui::SetCursorScreenPos(ImVec2(start_position.x + height + height / 2 + style.FramePadding.x, start_position.y));
+            ImGui::Text("%s", extruders[extruder_idx].c_str());
+            ImGui::PopID();
+        }
+
+        ImGui::EndCombo();
+    }
+
+    ImVec2      backup_pos = ImGui::GetCursorScreenPos();
+    ImGuiStyle &style      = ImGui::GetStyle();
+
+    ImGui::SetCursorScreenPos(ImVec2(combo_pos.x + style.FramePadding.x, combo_pos.y + style.FramePadding.y));
+    ImVec2 p      = ImGui::GetCursorScreenPos();
+    float  height = ImGui::GetTextLineHeight();
+
+    ImGui::GetWindowDrawList()->AddRectFilled(p, ImVec2(p.x + height + height / 2, p.y + height),
+                                              IM_COL32(extruders_colors[selection_idx][0], extruders_colors[selection_idx][1],
+                                                       extruders_colors[selection_idx][2], 255));
+    ImGui::GetWindowDrawList()->AddRect(p, ImVec2(p.x + height + height / 2, p.y + height), IM_COL32_BLACK);
+
+    ImGui::SetCursorScreenPos(ImVec2(p.x + height + height / 2 + style.FramePadding.x, p.y));
+    ImGui::Text("%s", extruders[selection_out].c_str());
+    ImGui::SetCursorScreenPos(backup_pos);
+    ImGui::EndGroup();
+
+    selection_idx = selection_out;
+}
+
+void GLGizmoMmuSegmentation::on_render_input_window(float x, float y, float bottom_limit)
+{
+    if (!m_c->selection_info()->model_object())
+        return;
+
+    const float approx_height = m_imgui->scaled(23.0f);
+                            y = std::min(y, bottom_limit - approx_height);
+    m_imgui->set_next_window_pos(x, y, ImGuiCond_Always);
+
+    m_imgui->begin(on_get_name(), ImGuiWindowFlags_NoMove | ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoCollapse);
+
+    // First calculate width of all the texts that are could possibly be shown. We will decide set the dialog width based on that:
+    const float clipping_slider_left = std::max(m_imgui->calc_text_size(m_desc.at("clipping_of_view")).x,
+                                                m_imgui->calc_text_size(m_desc.at("reset_direction")).x) + m_imgui->scaled(1.5f);
+    const float cursor_slider_left       = m_imgui->calc_text_size(m_desc.at("cursor_size")).x + m_imgui->scaled(1.f);
+    const float autoset_slider_left      = m_imgui->calc_text_size(m_desc.at("seed_fill_angle")).x + m_imgui->scaled(1.f);
+    const float cursor_type_radio_left   = m_imgui->calc_text_size(m_desc.at("cursor_type")).x + m_imgui->scaled(1.f);
+    const float cursor_type_radio_width1 = m_imgui->calc_text_size(m_desc["circle"]).x + m_imgui->scaled(2.5f);
+    const float cursor_type_radio_width2 = m_imgui->calc_text_size(m_desc["sphere"]).x + m_imgui->scaled(2.5f);
+    const float button_width             = m_imgui->calc_text_size(m_desc.at("remove_all")).x + m_imgui->scaled(1.f);
+    const float buttons_width            = m_imgui->scaled(0.5f);
+    const float minimal_slider_width     = m_imgui->scaled(4.f);
+    const float color_button_width       = m_imgui->calc_text_size("").x + m_imgui->scaled(1.75f);
+    const float combo_label_width        = std::max(m_imgui->calc_text_size(m_desc.at("first_color")).x,
+                                                    m_imgui->calc_text_size(m_desc.at("second_color")).x) + m_imgui->scaled(1.f);
+
+    float caption_max    = 0.f;
+    float total_text_max = 0.;
+    for (const std::string &t : {"first_color", "second_color", "remove"}) {
+        caption_max    = std::max(caption_max, m_imgui->calc_text_size(m_desc.at(t + "_caption")).x);
+        total_text_max = std::max(total_text_max, caption_max + m_imgui->calc_text_size(m_desc.at(t)).x);
+    }
+    caption_max += m_imgui->scaled(1.f);
+    total_text_max += m_imgui->scaled(1.f);
+
+    float window_width = minimal_slider_width + std::max(autoset_slider_left, std::max(cursor_slider_left, clipping_slider_left));
+    window_width       = std::max(window_width, total_text_max);
+    window_width       = std::max(window_width, button_width);
+    window_width       = std::max(window_width, cursor_type_radio_left + cursor_type_radio_width1 + cursor_type_radio_width2);
+    window_width       = std::max(window_width, 2.f * buttons_width + m_imgui->scaled(1.f));
+
+    auto draw_text_with_caption = [this, &caption_max](const wxString &caption, const wxString &text) {
+        m_imgui->text_colored(ImGuiWrapper::COL_ORANGE_LIGHT, caption);
+        ImGui::SameLine(caption_max);
+        m_imgui->text(text);
+    };
+
+    for (const std::string &t : {"first_color", "second_color", "remove"})
+        draw_text_with_caption(m_desc.at(t + "_caption"), m_desc.at(t));
+
+    m_imgui->text("");
+    ImGui::Separator();
+
+    const std::array<uint8_t, 3> &select_first_color  = m_modified_extruders_colors[m_first_selected_extruder_idx];
+    const std::array<uint8_t, 3> &select_second_color = m_modified_extruders_colors[m_second_selected_extruder_idx];
+
+    m_imgui->text(m_desc.at("first_color"));
+    ImGui::SameLine(combo_label_width);
+    ImGui::PushItemWidth(window_width - combo_label_width - color_button_width);
+    render_extruders_combo("##first_color_combo", m_original_extruders_names, m_original_extruders_colors, m_first_selected_extruder_idx);
+    ImGui::SameLine();
+
+    ImVec4 first_color = ImVec4(float(select_first_color[0]) / 255.0f, float(select_first_color[1]) / 255.0f, float(select_first_color[2]) / 255.0f, 1.0f);
+    ImVec4 second_color = ImVec4(float(select_second_color[0]) / 255.0f, float(select_second_color[1]) / 255.0f, float(select_second_color[2]) / 255.0f, 1.0f);
+    if(ImGui::ColorEdit4("First color##color_picker", (float*)&first_color, ImGuiColorEditFlags_NoAlpha | ImGuiColorEditFlags_NoInputs | ImGuiColorEditFlags_NoLabel))
+        m_modified_extruders_colors[m_first_selected_extruder_idx] = {uint8_t(first_color.x * 255.0f), uint8_t(first_color.y * 255.0f), uint8_t(first_color.z * 255.0f)};
+
+    m_imgui->text(m_desc.at("second_color"));
+    ImGui::SameLine(combo_label_width);
+    ImGui::PushItemWidth(window_width - combo_label_width - color_button_width);
+    render_extruders_combo("##second_color_combo", m_original_extruders_names, m_original_extruders_colors, m_second_selected_extruder_idx);
+    ImGui::SameLine();
+    if(ImGui::ColorEdit4("Second color##color_picker", (float*)&second_color, ImGuiColorEditFlags_NoAlpha | ImGuiColorEditFlags_NoInputs | ImGuiColorEditFlags_NoLabel))
+        m_modified_extruders_colors[m_second_selected_extruder_idx] = {uint8_t(second_color.x * 255.0f), uint8_t(second_color.y * 255.0f), uint8_t(second_color.z * 255.0f)};
+
+    ImGui::Separator();
+
+    if (m_imgui->checkbox(_L("Seed fill"), m_seed_fill_enabled))
+        if (!m_seed_fill_enabled)
+            for (auto &triangle_selector : m_triangle_selectors)
+                triangle_selector->seed_fill_unselect_all_triangles();
+
+    m_imgui->text(m_desc["seed_fill_angle"] + ":");
+    ImGui::AlignTextToFramePadding();
+    std::string format_str = std::string("%.f") + I18N::translate_utf8("°", "Degree sign to use in the respective slider in FDM supports gizmo,"
+                                                                            "placed after the number with no whitespace in between.");
+    ImGui::SameLine(autoset_slider_left);
+    ImGui::PushItemWidth(window_width - autoset_slider_left);
+    m_imgui->disabled_begin(!m_seed_fill_enabled);
+    m_imgui->slider_float("##seed_fill_angle", &m_seed_fill_angle, 0.f, 90.f, format_str.data());
+    m_imgui->disabled_end();
+
+    ImGui::Separator();
+
+    if (m_imgui->button(m_desc.at("remove_all"))) {
+        Plater::TakeSnapshot snapshot(wxGetApp().plater(), wxString(_L("Reset selection")));
+        ModelObject *mo  = m_c->selection_info()->model_object();
+        int          idx = -1;
+        for (ModelVolume *mv : mo->volumes) {
+            if (mv->is_model_part()) {
+                ++idx;
+                size_t extruder_id = (mv->extruder_id() > 0) ? mv->extruder_id() - 1 : 0;
+                m_triangle_selectors[idx]->reset(EnforcerBlockerType(extruder_id));
+            }
+        }
+
+        update_model_object();
+        m_parent.set_as_dirty();
+    }
+
+    const float max_tooltip_width = ImGui::GetFontSize() * 20.0f;
+
+    ImGui::AlignTextToFramePadding();
+    m_imgui->text(m_desc.at("cursor_size"));
+    ImGui::SameLine(cursor_slider_left);
+    ImGui::PushItemWidth(window_width - cursor_slider_left);
+    ImGui::SliderFloat(" ", &m_cursor_radius, CursorRadiusMin, CursorRadiusMax, "%.2f");
+    if (ImGui::IsItemHovered()) {
+        ImGui::BeginTooltip();
+        ImGui::PushTextWrapPos(max_tooltip_width);
+        ImGui::TextUnformatted(_L("Alt + Mouse wheel").ToUTF8().data());
+        ImGui::PopTextWrapPos();
+        ImGui::EndTooltip();
+    }
+
+    ImGui::AlignTextToFramePadding();
+    m_imgui->text(m_desc.at("cursor_type"));
+    ImGui::SameLine(cursor_type_radio_left + m_imgui->scaled(0.f));
+    ImGui::PushItemWidth(cursor_type_radio_width1);
+
+    bool sphere_sel = m_cursor_type == TriangleSelector::CursorType::SPHERE;
+    if (m_imgui->radio_button(m_desc["sphere"], sphere_sel))
+        sphere_sel = true;
+
+    if (ImGui::IsItemHovered()) {
+        ImGui::BeginTooltip();
+        ImGui::PushTextWrapPos(max_tooltip_width);
+        ImGui::TextUnformatted(_L("Paints all facets inside, regardless of their orientation.").ToUTF8().data());
+        ImGui::PopTextWrapPos();
+        ImGui::EndTooltip();
+    }
+
+    ImGui::SameLine(cursor_type_radio_left + cursor_type_radio_width2 + m_imgui->scaled(0.f));
+    ImGui::PushItemWidth(cursor_type_radio_width2);
+
+    if (m_imgui->radio_button(m_desc["circle"], !sphere_sel))
+        sphere_sel = false;
+
+    if (ImGui::IsItemHovered()) {
+        ImGui::BeginTooltip();
+        ImGui::PushTextWrapPos(max_tooltip_width);
+        ImGui::TextUnformatted(_L("Ignores facets facing away from the camera.").ToUTF8().data());
+        ImGui::PopTextWrapPos();
+        ImGui::EndTooltip();
+    }
+
+    m_cursor_type = sphere_sel ? TriangleSelector::CursorType::SPHERE : TriangleSelector::CursorType::CIRCLE;
+
+    m_imgui->checkbox(_L("Split triangles"), m_triangle_splitting_enabled);
+
+    ImGui::Separator();
+    if (m_c->object_clipper()->get_position() == 0.f) {
+        ImGui::AlignTextToFramePadding();
+        m_imgui->text(m_desc.at("clipping_of_view"));
+    } else {
+        if (m_imgui->button(m_desc.at("reset_direction"))) {
+            wxGetApp().CallAfter([this]() { m_c->object_clipper()->set_position(-1., false); });
+        }
+    }
+
+    ImGui::SameLine(clipping_slider_left);
+    ImGui::PushItemWidth(window_width - clipping_slider_left);
+    auto clp_dist = float(m_c->object_clipper()->get_position());
+    if (ImGui::SliderFloat("  ", &clp_dist, 0.f, 1.f, "%.2f"))
+        m_c->object_clipper()->set_position(clp_dist, true);
+    if (ImGui::IsItemHovered()) {
+        ImGui::BeginTooltip();
+        ImGui::PushTextWrapPos(max_tooltip_width);
+        ImGui::TextUnformatted(_L("Ctrl + Mouse wheel").ToUTF8().data());
+        ImGui::PopTextWrapPos();
+        ImGui::EndTooltip();
+    }
+    m_imgui->end();
+}
+
+void GLGizmoMmuSegmentation::update_model_object() const
+{
+    bool updated = false;
+    ModelObject* mo = m_c->selection_info()->model_object();
+    int idx = -1;
+    for (ModelVolume* mv : mo->volumes) {
+        if (! mv->is_model_part())
+            continue;
+        ++idx;
+        updated |= mv->mmu_segmentation_facets.set(*m_triangle_selectors[idx].get());
+    }
+
+    if (updated)
+        m_parent.post_event(SimpleEvent(EVT_GLCANVAS_SCHEDULE_BACKGROUND_PROCESS));
+}
+
+void GLGizmoMmuSegmentation::init_model_triangle_selectors()
+{
+    const ModelObject *mo = m_c->selection_info()->model_object();
+    m_triangle_selectors.clear();
+
+    for (const ModelVolume *mv : mo->volumes) {
+        if (!mv->is_model_part())
+            continue;
+
+        // This mesh does not account for the possible Z up SLA offset.
+        const TriangleMesh *mesh = &mv->mesh();
+
+        size_t extruder_id = (mv->extruder_id() > 0) ? mv->extruder_id() - 1 : 0;
+        m_triangle_selectors.emplace_back(std::make_unique<TriangleSelectorMmuGui>(*mesh, m_modified_extruders_colors));
+        m_triangle_selectors.back()->deserialize(mv->mmu_segmentation_facets.get_data(), EnforcerBlockerType(extruder_id));
+    }
+}
+
+void GLGizmoMmuSegmentation::update_from_model_object()
+{
+    wxBusyCursor wait;
+    this->init_model_triangle_selectors();
+}
+
+PainterGizmoType GLGizmoMmuSegmentation::get_painter_type() const
+{
+    return PainterGizmoType::MMU_SEGMENTATION;
+}
+
+void TriangleSelectorMmuGui::render(ImGuiWrapper *imgui)
+{
+    std::vector<int> color_cnt(m_iva_colors.size());
+    int              seed_fill_cnt = 0;
+    for (auto &iva_color : m_iva_colors)
+        iva_color.release_geometry();
+    m_iva_seed_fill.release_geometry();
+
+    for (size_t color_idx = 0; color_idx < m_iva_colors.size(); ++color_idx) {
+        for (const Triangle &tr : m_triangles) {
+            if (!tr.valid || tr.is_split() || tr.is_selected_by_seed_fill() || tr.get_state() != EnforcerBlockerType(color_idx))
+                continue;
+
+            for (int i = 0; i < 3; ++i)
+                m_iva_colors[color_idx].push_geometry(double(m_vertices[tr.verts_idxs[i]].v[0]),
+                                                      double(m_vertices[tr.verts_idxs[i]].v[1]),
+                                                      double(m_vertices[tr.verts_idxs[i]].v[2]),
+                                                      double(tr.normal[0]),
+                                                      double(tr.normal[1]),
+                                                      double(tr.normal[2]));
+            m_iva_colors[color_idx].push_triangle(color_cnt[color_idx], color_cnt[color_idx] + 1, color_cnt[color_idx] + 2);
+            color_cnt[color_idx] += 3;
+        }
+    }
+
+    for (const Triangle &tr : m_triangles) {
+        if (!tr.valid || tr.is_split() || !tr.is_selected_by_seed_fill()) continue;
+
+        for (int i = 0; i < 3; ++i)
+            m_iva_seed_fill.push_geometry(double(m_vertices[tr.verts_idxs[i]].v[0]),
+                                          double(m_vertices[tr.verts_idxs[i]].v[1]),
+                                          double(m_vertices[tr.verts_idxs[i]].v[2]),
+                                          double(tr.normal[0]),
+                                          double(tr.normal[1]),
+                                          double(tr.normal[2]));
+        m_iva_seed_fill.push_triangle(seed_fill_cnt, seed_fill_cnt + 1, seed_fill_cnt + 2);
+        seed_fill_cnt += 3;
+    }
+
+    for (auto &iva_color : m_iva_colors)
+        iva_color.finalize_geometry(true);
+    m_iva_seed_fill.finalize_geometry(true);
+
+    std::vector<bool> render_colors(m_iva_colors.size());
+    for (size_t color_idx = 0; color_idx < m_iva_colors.size(); ++color_idx)
+        render_colors[color_idx] = m_iva_colors[color_idx].has_VBOs();
+    bool render_seed_fill = m_iva_seed_fill.has_VBOs();
+
+    auto *shader = wxGetApp().get_shader("gouraud");
+    if (!shader) return;
+
+    shader->start_using();
+    ScopeGuard guard([shader]() {
+        if (shader)
+            shader->stop_using();
+    });
+    shader->set_uniform("slope.actived", false);
+
+    for (size_t color_idx = 0; color_idx < m_iva_colors.size(); ++color_idx) {
+        if (render_colors[color_idx]) {
+            std::array<float, 4> color = {float(m_colors[color_idx][0]) / 255.0f, float(m_colors[color_idx][1]) / 255.0f,
+                                          float(m_colors[color_idx][2]) / 255.0f, 1.f};
+            shader->set_uniform("uniform_color", color);
+            m_iva_colors[color_idx].render();
+        }
+    }
+
+    if (render_seed_fill) {
+        std::array<float, 4> color = {0.f, 1.f, 0.44f, 1.f};
+        shader->set_uniform("uniform_color", color);
+        m_iva_seed_fill.render();
+    }
+}
+
+} // namespace Slic3r

src/slic3r/GUI/Gizmos/GLGizmoMmuSegmentation.hpp

@@ -0,0 +1,69 @@
+#ifndef slic3r_GLGizmoMmuSegmentation_hpp_
+#define slic3r_GLGizmoMmuSegmentation_hpp_
+
+#include "GLGizmoPainterBase.hpp"
+
+namespace Slic3r::GUI {
+
+class TriangleSelectorMmuGui : public TriangleSelectorGUI {
+public:
+    explicit TriangleSelectorMmuGui(const TriangleMesh& mesh, const std::vector<std::array<uint8_t, 3>> &colors)
+        : TriangleSelectorGUI(mesh), m_colors(colors) {
+        m_iva_colors = std::vector<GLIndexedVertexArray>(colors.size());
+    }
+
+    // Render current selection. Transformation matrices are supposed
+    // to be already set.
+    void render(ImGuiWrapper* imgui) override;
+
+private:
+    const std::vector<std::array<uint8_t, 3>> &m_colors;
+    std::vector<GLIndexedVertexArray> m_iva_colors;
+};
+
+class GLGizmoMmuSegmentation : public GLGizmoPainterBase
+{
+public:
+    GLGizmoMmuSegmentation(GLCanvas3D& parent, const std::string& icon_filename, unsigned int sprite_id)
+        : GLGizmoPainterBase(parent, icon_filename, sprite_id) {}
+
+    void render_painter_gizmo() const override;
+
+    bool gizmo_event(SLAGizmoEventType action, const Vec2d& mouse_position, bool shift_down, bool alt_down, bool control_down) override;
+
+    virtual void set_painter_gizmo_data(const Selection& selection) override;
+
+protected:
+    void on_render_input_window(float x, float y, float bottom_limit) override;
+    std::string on_get_name() const override;
+
+    bool on_is_selectable() const override;
+
+    size_t                              m_first_selected_extruder_idx  = 0;
+    size_t                              m_second_selected_extruder_idx = 1;
+    std::vector<std::string>            m_original_extruders_names;
+    std::vector<std::array<uint8_t, 3>> m_original_extruders_colors;
+    std::vector<std::array<uint8_t, 3>> m_modified_extruders_colors;
+
+private:
+    bool on_init() override;
+
+    void update_model_object() const override;
+    void update_from_model_object() override;
+
+    void on_opening() override {}
+    void on_shutdown() override;
+    PainterGizmoType get_painter_type() const override;
+
+    void init_model_triangle_selectors();
+    void init_extruders_data();
+
+    // This map holds all translated description texts, so they can be easily referenced during layout calculations
+    // etc. When language changes, GUI is recreated and this class constructed again, so the change takes effect.
+    std::map<std::string, wxString> m_desc;
+};
+
+} // namespace Slic3r
+
+
+#endif // slic3r_GLGizmoMmuSegmentation_hpp_

src/slic3r/GUI/Gizmos/GLGizmoPainterBase.cpp

@@ -73,7 +73,7 @@ void GLGizmoPainterBase::activate_internal_undo_redo_stack(bool activate)
     if (activate && ! m_internal_stack_active) {
         wxString str = get_painter_type() == PainterGizmoType::FDM_SUPPORTS
                            ? _L("Entering Paint-on supports")
-                           : _L("Entering Seam painting");
+                           : (get_painter_type() == PainterGizmoType::MMU_SEGMENTATION ? _L("Entering MMU segmentation") : _L("Entering Seam painting"));
         Plater::TakeSnapshot(wxGetApp().plater(), str);
         wxGetApp().plater()->enter_gizmos_stack();
         m_internal_stack_active = true;
@@ -81,7 +81,7 @@ void GLGizmoPainterBase::activate_internal_undo_redo_stack(bool activate)
     if (! activate && m_internal_stack_active) {
         wxString str = get_painter_type() == PainterGizmoType::SEAM
                            ? _L("Leaving Seam painting")
-                           : _L("Leaving Paint-on supports");
+                           : (get_painter_type() == PainterGizmoType::MMU_SEGMENTATION ? _L("Leaving MMU segmentation") : _L("Leaving Paint-on supports"));
         wxGetApp().plater()->leave_gizmos_stack();
         Plater::TakeSnapshot(wxGetApp().plater(), str);
         m_internal_stack_active = false;
@@ -180,11 +180,12 @@ void GLGizmoPainterBase::render_cursor() const
     if (m_rr.mesh_id == -1)
         return;
 
-
-    if (m_cursor_type == TriangleSelector::SPHERE)
-        render_cursor_sphere(trafo_matrices[m_rr.mesh_id]);
-    else
-        render_cursor_circle();
+    if (!m_seed_fill_enabled) {
+        if (m_cursor_type == TriangleSelector::SPHERE)
+            render_cursor_sphere(trafo_matrices[m_rr.mesh_id]);
+        else
+            render_cursor_circle();
+    }
 }
 
 
@@ -388,14 +389,50 @@ bool GLGizmoPainterBase::gizmo_event(SLAGizmoEventType action, const Vec2d& mous
             Vec3f camera_pos = (trafo_matrix.inverse() * camera.get_position()).cast<float>();
 
             assert(m_rr.mesh_id < int(m_triangle_selectors.size()));
-            m_triangle_selectors[m_rr.mesh_id]->select_patch(m_rr.hit, m_rr.facet, camera_pos,
-                                       m_cursor_radius, m_cursor_type, new_state, trafo_matrix);
+            if (m_seed_fill_enabled)
+                m_triangle_selectors[m_rr.mesh_id]->seed_fill_apply_on_triangles(new_state);
+            else
+                m_triangle_selectors[m_rr.mesh_id]->select_patch(m_rr.hit, int(m_rr.facet), camera_pos, m_cursor_radius, m_cursor_type,
+                                                                 new_state, trafo_matrix, m_triangle_splitting_enabled);
             m_last_mouse_click = mouse_position;
         }
 
         return true;
     }
 
+    if (action == SLAGizmoEventType::Moving && m_seed_fill_enabled) {
+        if (m_triangle_selectors.empty())
+            return false;
+
+        const Camera &       camera         = wxGetApp().plater()->get_camera();
+        const Selection &    selection      = m_parent.get_selection();
+        const ModelObject *  mo             = m_c->selection_info()->model_object();
+        const ModelInstance *mi             = mo->instances[selection.get_instance_idx()];
+        const Transform3d &  instance_trafo = mi->get_transformation().get_matrix();
+
+        // Precalculate transformations of individual meshes.
+        std::vector<Transform3d> trafo_matrices;
+        for (const ModelVolume *mv : mo->volumes)
+            if (mv->is_model_part())
+                trafo_matrices.emplace_back(instance_trafo * mv->get_matrix());
+
+        // Now "click" into all the prepared points and spill paint around them.
+        update_raycast_cache(mouse_position, camera, trafo_matrices);
+
+        if (m_rr.mesh_id == -1) {
+            // Clean selected by seed fill for all triangles
+            for (auto &triangle_selector : m_triangle_selectors)
+                triangle_selector->seed_fill_unselect_all_triangles();
+
+            // In case we have no valid hit, we can return.
+            return false;
+        }
+
+        assert(m_rr.mesh_id < int(m_triangle_selectors.size()));
+        m_triangle_selectors[m_rr.mesh_id]->seed_fill_select_triangles(m_rr.hit, int(m_rr.facet), m_seed_fill_angle);
+        return true;
+    }
+
     if ((action == SLAGizmoEventType::LeftUp || action == SLAGizmoEventType::RightUp)
       && m_button_down != Button::None) {
         // Take snapshot and update ModelVolume data.
@@ -558,12 +595,14 @@ void TriangleSelectorGUI::render(ImGuiWrapper* imgui)
 {
     int enf_cnt = 0;
     int blc_cnt = 0;
+    int seed_fill_cnt = 0;
 
     m_iva_enforcers.release_geometry();
     m_iva_blockers.release_geometry();
+    m_iva_seed_fill.release_geometry();
 
     for (const Triangle& tr : m_triangles) {
-        if (! tr.valid || tr.is_split() || tr.get_state() == EnforcerBlockerType::NONE)
+        if (!tr.valid || tr.is_split() || tr.get_state() == EnforcerBlockerType::NONE || tr.is_selected_by_seed_fill())
             continue;
 
         GLIndexedVertexArray& va = tr.get_state() == EnforcerBlockerType::ENFORCER
@@ -580,17 +619,32 @@ void TriangleSelectorGUI::render(ImGuiWrapper* imgui)
                              double(tr.normal[0]),
                              double(tr.normal[1]),
                              double(tr.normal[2]));
-        va.push_triangle(cnt,
-                         cnt+1,
-                         cnt+2);
+        va.push_triangle(cnt, cnt + 1, cnt + 2);
         cnt += 3;
     }
 
+    for (const Triangle &tr : m_triangles) {
+        if (!tr.valid || tr.is_split() || !tr.is_selected_by_seed_fill())
+            continue;
+
+        for (int i = 0; i < 3; ++i)
+            m_iva_seed_fill.push_geometry(double(m_vertices[tr.verts_idxs[i]].v[0]),
+                                          double(m_vertices[tr.verts_idxs[i]].v[1]),
+                                          double(m_vertices[tr.verts_idxs[i]].v[2]),
+                                          double(tr.normal[0]),
+                                          double(tr.normal[1]),
+                                          double(tr.normal[2]));
+        m_iva_seed_fill.push_triangle(seed_fill_cnt, seed_fill_cnt + 1, seed_fill_cnt + 2);
+        seed_fill_cnt += 3;
+    }
+
     m_iva_enforcers.finalize_geometry(true);
     m_iva_blockers.finalize_geometry(true);
+    m_iva_seed_fill.finalize_geometry(true);
 
     bool render_enf = m_iva_enforcers.has_VBOs();
     bool render_blc = m_iva_blockers.has_VBOs();
+    bool render_seed_fill = m_iva_seed_fill.has_VBOs();
 
     auto* shader = wxGetApp().get_shader("gouraud");
     if (! shader)
@@ -612,6 +666,12 @@ void TriangleSelectorGUI::render(ImGuiWrapper* imgui)
         m_iva_blockers.render();
     }
 
+    if (render_seed_fill) {
+        std::array<float, 4> color = { 0.f, 1.00f, 0.44f, 1.f };
+        shader->set_uniform("uniform_color", color);
+        m_iva_seed_fill.render();
+    }
+
 
 #ifdef PRUSASLICER_TRIANGLE_SELECTOR_DEBUG
     if (imgui)

src/slic3r/GUI/Gizmos/GLGizmoPainterBase.hpp

@@ -12,7 +12,6 @@
 
 
 
-
 namespace Slic3r {
 
 enum class EnforcerBlockerType : int8_t;
@@ -22,10 +21,12 @@ namespace GUI {
 enum class SLAGizmoEventType : unsigned char;
 class ClippingPlane;
 struct Camera;
+class GLGizmoMmuSegmentation;
 
 enum class PainterGizmoType {
     FDM_SUPPORTS,
-    SEAM
+    SEAM,
+    MMU_SEGMENTATION
 };
 
 
@@ -36,7 +37,7 @@ public:
 
     // Render current selection. Transformation matrices are supposed
     // to be already set.
-    void render(ImGuiWrapper* imgui = nullptr);
+    virtual void render(ImGuiWrapper* imgui = nullptr);
 
 #ifdef PRUSASLICER_TRIANGLE_SELECTOR_DEBUG
     void render_debug(ImGuiWrapper* imgui);
@@ -48,6 +49,8 @@ private:
     GLIndexedVertexArray m_iva_enforcers;
     GLIndexedVertexArray m_iva_blockers;
     std::array<GLIndexedVertexArray, 3> m_varrays;
+protected:
+    GLIndexedVertexArray m_iva_seed_fill;
 };
 
 
@@ -65,8 +68,8 @@ private:
 public:
     GLGizmoPainterBase(GLCanvas3D& parent, const std::string& icon_filename, unsigned int sprite_id);
     ~GLGizmoPainterBase() override {}
-    void set_painter_gizmo_data(const Selection& selection);
-    bool gizmo_event(SLAGizmoEventType action, const Vec2d& mouse_position, bool shift_down, bool alt_down, bool control_down);
+    virtual void set_painter_gizmo_data(const Selection& selection);
+    virtual bool gizmo_event(SLAGizmoEventType action, const Vec2d& mouse_position, bool shift_down, bool alt_down, bool control_down);
 
     // Following function renders the triangles and cursor. Having this separated
     // from usual on_render method allows to render them before transparent objects,
@@ -94,6 +97,9 @@ protected:
 
     TriangleSelector::CursorType m_cursor_type = TriangleSelector::SPHERE;
 
+    bool  m_triangle_splitting_enabled = true;
+    bool  m_seed_fill_enabled          = false;
+    float m_seed_fill_angle            = 0.f;
 
 private:
     bool is_mesh_point_clipped(const Vec3d& point, const Transform3d& trafo) const;
@@ -141,6 +147,8 @@ protected:
     void on_load(cereal::BinaryInputArchive& ar) override;
     void on_save(cereal::BinaryOutputArchive& ar) const override {}
     CommonGizmosDataID on_get_requirements() const override;
+
+    friend class ::Slic3r::GUI::GLGizmoMmuSegmentation;
 };
 
 

src/slic3r/GUI/Gizmos/GLGizmoRotate.cpp

@@ -110,7 +110,7 @@ void GLGizmoRotate::on_update(const UpdateData& data)
     Vec2d orig_dir = Vec2d::UnitX();
     Vec2d new_dir = mouse_pos.normalized();
 
-    double theta = ::acos(clamp(-1.0, 1.0, new_dir.dot(orig_dir)));
+    double theta = ::acos(std::clamp(new_dir.dot(orig_dir), -1.0, 1.0));
     if (cross2(orig_dir, new_dir) < 0.0)
         theta = 2.0 * (double)PI - theta;
 

src/slic3r/GUI/Gizmos/GLGizmos.hpp

@@ -32,6 +32,7 @@ enum class SLAGizmoEventType : unsigned char {
 #include "slic3r/GUI/Gizmos/GLGizmoFlatten.hpp"
 #include "slic3r/GUI/Gizmos/GLGizmoSlaSupports.hpp"
 #include "slic3r/GUI/Gizmos/GLGizmoFdmSupports.hpp"
+#include "slic3r/GUI/Gizmos/GLGizmoMmuSegmentation.hpp"
 #include "slic3r/GUI/Gizmos/GLGizmoCut.hpp"
 #include "slic3r/GUI/Gizmos/GLGizmoHollow.hpp"
 

src/slic3r/GUI/Gizmos/GLGizmosCommon.hpp

@@ -32,7 +32,8 @@ enum class SLAGizmoEventType : unsigned char {
     ManualEditing,
     MouseWheelUp,
     MouseWheelDown,
-    ResetClippingPlane
+    ResetClippingPlane,
+    Moving
 };
 
 

src/slic3r/GUI/Gizmos/GLGizmosManager.cpp

@@ -19,6 +19,7 @@
 #include "slic3r/GUI/Gizmos/GLGizmoCut.hpp"
 #include "slic3r/GUI/Gizmos/GLGizmoHollow.hpp"
 #include "slic3r/GUI/Gizmos/GLGizmoSeam.hpp"
+#include "slic3r/GUI/Gizmos/GLGizmoMmuSegmentation.hpp"
 
 #include "libslic3r/Model.hpp"
 #include "libslic3r/PresetBundle.hpp"
@@ -108,6 +109,7 @@ bool GLGizmosManager::init()
     m_gizmos.emplace_back(new GLGizmoSlaSupports(m_parent, "sla_supports.svg", 6));
     m_gizmos.emplace_back(new GLGizmoFdmSupports(m_parent, "fdm_supports.svg", 7));
     m_gizmos.emplace_back(new GLGizmoSeam(m_parent, "seam.svg", 8));
+    m_gizmos.emplace_back(new GLGizmoMmuSegmentation(m_parent, "fdm_supports.svg", 9));
 
     m_common_gizmos_data.reset(new CommonGizmosDataPool(&m_parent));
 
@@ -401,6 +403,7 @@ void GLGizmosManager::set_painter_gizmo_data()
 
     dynamic_cast<GLGizmoFdmSupports*>(m_gizmos[FdmSupports].get())->set_painter_gizmo_data(m_parent.get_selection());
     dynamic_cast<GLGizmoSeam*>(m_gizmos[Seam].get())->set_painter_gizmo_data(m_parent.get_selection());
+    dynamic_cast<GLGizmoMmuSegmentation*>(m_gizmos[MmuSegmentation].get())->set_painter_gizmo_data(m_parent.get_selection());
 }
 
 // Returns true if the gizmo used the event to do something, false otherwise.
@@ -417,6 +420,8 @@ bool GLGizmosManager::gizmo_event(SLAGizmoEventType action, const Vec2d& mouse_p
         return dynamic_cast<GLGizmoFdmSupports*>(m_gizmos[FdmSupports].get())->gizmo_event(action, mouse_position, shift_down, alt_down, control_down);
     else if (m_current == Seam)
         return dynamic_cast<GLGizmoSeam*>(m_gizmos[Seam].get())->gizmo_event(action, mouse_position, shift_down, alt_down, control_down);
+    else if (m_current == MmuSegmentation)
+        return dynamic_cast<GLGizmoMmuSegmentation*>(m_gizmos[MmuSegmentation].get())->gizmo_event(action, mouse_position, shift_down, alt_down, control_down);
     else
         return false;
 }
@@ -493,7 +498,7 @@ bool GLGizmosManager::on_mouse_wheel(wxMouseEvent& evt)
 {
     bool processed = false;
 
-    if (m_current == SlaSupports || m_current == Hollow || m_current == FdmSupports || m_current == Seam) {
+    if (m_current == SlaSupports || m_current == Hollow || m_current == FdmSupports || m_current == Seam || m_current == MmuSegmentation) {
         float rot = (float)evt.GetWheelRotation() / (float)evt.GetWheelDelta();
         if (gizmo_event((rot > 0.f ? SLAGizmoEventType::MouseWheelUp : SLAGizmoEventType::MouseWheelDown), Vec2d::Zero(), evt.ShiftDown(), evt.AltDown(), evt.ControlDown()))
             processed = true;
@@ -518,9 +523,11 @@ bool GLGizmosManager::on_mouse(wxMouseEvent& evt)
     bool control_down = evt.CmdDown();
 
     // mouse anywhere
-    if (evt.Moving())
+    if (evt.Moving()) {
         m_tooltip = update_hover_state(mouse_pos);
-    else if (evt.LeftUp()) {
+        if (m_current == MmuSegmentation)
+            gizmo_event(SLAGizmoEventType::Moving, mouse_pos, evt.ShiftDown(), evt.AltDown());
+    } else if (evt.LeftUp()) {
         if (m_mouse_capture.left) {
             processed = true;
             m_mouse_capture.left = false;
@@ -626,7 +633,7 @@ bool GLGizmosManager::on_mouse(wxMouseEvent& evt)
         m_tooltip = "";
 
         if (evt.LeftDown() && (!control_down || grabber_contains_mouse())) {
-            if ((m_current == SlaSupports || m_current == Hollow || m_current == FdmSupports || m_current == Seam)
+            if ((m_current == SlaSupports || m_current == Hollow || m_current == FdmSupports || m_current == Seam || m_current == MmuSegmentation)
                 && gizmo_event(SLAGizmoEventType::LeftDown, mouse_pos, evt.ShiftDown(), evt.AltDown()))
                 // the gizmo got the event and took some action, there is no need to do anything more
                 processed = true;
@@ -652,16 +659,16 @@ bool GLGizmosManager::on_mouse(wxMouseEvent& evt)
             // event was taken care of by the SlaSupports gizmo
             processed = true;
         }
-        else if (evt.RightDown() && !control_down && selected_object_idx != -1 && (m_current == FdmSupports || m_current == Seam)
+        else if (evt.RightDown() && !control_down && selected_object_idx != -1 && (m_current == FdmSupports || m_current == Seam || m_current == MmuSegmentation)
             && gizmo_event(SLAGizmoEventType::RightDown, mouse_pos)) {
-            // event was taken care of by the FdmSupports / Seam gizmo
+            // event was taken care of by the FdmSupports / Seam / MMUPainting gizmo
             processed = true;
         }
         else if (evt.Dragging() && m_parent.get_move_volume_id() != -1
-             && (m_current == SlaSupports || m_current == Hollow || m_current == FdmSupports || m_current == Seam))
+            && (m_current == SlaSupports || m_current == Hollow || m_current == FdmSupports || m_current == Seam || m_current == MmuSegmentation))
             // don't allow dragging objects with the Sla gizmo on
             processed = true;
-        else if (evt.Dragging() && !control_down && (m_current == SlaSupports || m_current == Hollow || m_current == FdmSupports || m_current == Seam)
+        else if (evt.Dragging() && !control_down && (m_current == SlaSupports || m_current == Hollow || m_current == FdmSupports || m_current == Seam  || m_current == MmuSegmentation)
             && gizmo_event(SLAGizmoEventType::Dragging, mouse_pos, evt.ShiftDown(), evt.AltDown())) {
             // the gizmo got the event and took some action, no need to do anything more here
             m_parent.set_as_dirty();
@@ -674,7 +681,7 @@ bool GLGizmosManager::on_mouse(wxMouseEvent& evt)
             else if (evt.RightIsDown())
                 gizmo_event(SLAGizmoEventType::RightUp, mouse_pos, evt.ShiftDown(), evt.AltDown(), true);
         }
-        else if (evt.LeftUp() && (m_current == SlaSupports || m_current == Hollow || m_current == FdmSupports || m_current == Seam) && !m_parent.is_mouse_dragging()) {
+        else if (evt.LeftUp() && (m_current == SlaSupports || m_current == Hollow || m_current == FdmSupports || m_current == Seam || m_current == MmuSegmentation) && !m_parent.is_mouse_dragging()) {
             // in case SLA/FDM gizmo is selected, we just pass the LeftUp event and stop processing - neither
             // object moving or selecting is suppressed in that case
             gizmo_event(SLAGizmoEventType::LeftUp, mouse_pos, evt.ShiftDown(), evt.AltDown(), control_down);
@@ -684,7 +691,7 @@ bool GLGizmosManager::on_mouse(wxMouseEvent& evt)
             // to avoid to loose the selection when user clicks an the white faces of a different object while the Flatten gizmo is active
             processed = true;
         }
-        else if (evt.RightUp() && (m_current == FdmSupports || m_current == Seam) && !m_parent.is_mouse_dragging()) {
+        else if (evt.RightUp() && (m_current == FdmSupports || m_current == Seam || m_current == MmuSegmentation) && !m_parent.is_mouse_dragging()) {
             gizmo_event(SLAGizmoEventType::RightUp, mouse_pos, evt.ShiftDown(), evt.AltDown(), control_down);
             processed = true;
         }
@@ -768,7 +775,7 @@ bool GLGizmosManager::on_char(wxKeyEvent& evt)
         case 'r' :
         case 'R' :
         {
-            if ((m_current == SlaSupports || m_current == Hollow || m_current == FdmSupports || m_current == Seam) && gizmo_event(SLAGizmoEventType::ResetClippingPlane))
+            if ((m_current == SlaSupports || m_current == Hollow || m_current == FdmSupports || m_current == Seam || m_current == MmuSegmentation) && gizmo_event(SLAGizmoEventType::ResetClippingPlane))
                 processed = true;
 
             break;

src/slic3r/GUI/Gizmos/GLGizmosManager.hpp

@@ -68,6 +68,7 @@ public:
         SlaSupports,
         FdmSupports,
         Seam,
+        MmuSegmentation,
         Undefined
     };